Electrical power

• What is the formula for power in an electrical component?

  $P =$$I \times V$
• What does power represent in an electrical component?

  Power is the rate at which the component converts energy from charge carriers into other forms.
• In what units is current measured?

  Amps
• In what units is potential difference measured?

  Volts
• In what units is power measured?

  Watts
• If a microwave has a power output of 1200 watts and operates at a potential difference of 240 volts, what is the current through it?

  5 amps
• What is the first step in calculating the current through an electrical component?

  • Write down the key information
  • Check the units
• How do you rearrange the power equation to solve for current?

  Current is equal to power divided by potential difference.
• What is the current through the microwave when the power is 1200 watts and the potential difference is 240 volts?

  5 amps
• How can the power output of an electrical component be increased?

  • Increase the current
  • Increase the potential difference
• What happens to the brightness of a bulb if more power is supplied to it?

  The brightness of the bulb increases.
• What effect does removing a resistor have on the power in a circuit?

  It increases the power by decreasing the total resistance and increasing the current.
• What should you explain regarding changes in potential difference, current, or resistance for your exam?

  • How changing potential difference affects power
  • How changing current affects power
  • How changing resistance affects power
• What is the power rating of the microwave mentioned in the example?

  1200 watts
• What potential difference is supplied to the microwave in the example?

  240 volts
• Why is it important to keep below the potential difference and power range specified on components?

  Exceeding these limits can become dangerous.
• What features does the Smart Learning platform offer for revision?

  • Interactive quizzes
  • Easy to follow videos
  • AI tutor support